231 lines
7.4 KiB
Haskell
231 lines
7.4 KiB
Haskell
{-# LANGUAGE RecordWildCards, BangPatterns #-}
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-- | Module for drawing primitives
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module Affection.Draw
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(
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-- drawRect
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drawRect'
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-- , clear
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, handleDrawRequest
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, invalidateDrawRequest
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-- , present
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, clearArea
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) where
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import Affection.Types
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import Foreign
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import Foreign.C.Types
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import Control.Monad.State (get, put)
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import Control.Monad (when, unless)
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import System.Glib.GObject
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import qualified SDL
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import qualified BABL as B
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import qualified GEGL as G
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import Debug.Trace
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-- | Draw a rectangle on target buffer
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-- drawRect
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-- :: G.GeglBuffer -- ^ Target buffer
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-- -> G.GeglNode -- ^ Target node
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-- -> G.Color -- ^ Color to draw in
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-- -> DrawType -- ^ Draw type
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-- -> GeglRectangle -- ^ Dimensions of Rectangle
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-- -> Affection us ()
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-- drawRect buf node color (Fill) rect@G.GeglRectangle{..} = do
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-- liftIO $ G.pixelPoke buf rect (B.PixelFormat B.RGBA B.CFdouble) G.GeglAccessReadWrite G.GeglAbyssNone $
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-- (\(x, y) ->
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-- let col = unsafeColorize color
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-- in
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-- G.Pixel x y col
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-- )
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-- ad@AffectionData{..} <- get
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-- put $ ad
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-- { drawStack = (DrawRequest rect buf False) : drawStack
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-- }
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-- drawRect buf node color (Line size) rect@G.GeglRectangle{..} = do
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-- liftIO $ G.pixelPoke buf rect (B.PixelFormat B.RGBA B.CFdouble) G.GeglAccessReadWrite G.GeglAbyssNone $
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-- (\(x, y) ->
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-- let col = unsafeColorize color
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-- in if not ((x >= rectangleX + size && x < rectangleX + rectangleWidth - size) &&
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-- (y >= rectangleY + size && y < rectangleY + rectangleHeight - size))
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-- then
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-- G.Pixel x y col
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-- else
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-- G.Pixel x y $ unsafeColorize $ G.RGBA 0 0 0 0
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-- )
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-- ad@AffectionData{..} <- get
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-- put $ ad
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-- { drawStack = (DrawRequest rect buf False) : drawStack
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-- }
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-- -- drawRect buf node color Fill (G.GeglRectangle rectangleX rectangleY rectangleWidth size)
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-- -- drawRect buf node color Fill (G.GeglRectangle rectangleX rectangleY size rectangleHeight)
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-- -- drawRect buf node color Fill (G.GeglRectangle (rectangleX + rectangleWidth - size) rectangleY size rectangleHeight)
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-- -- drawRect buf node color Fill (G.GeglRectangle rectangleX (rectangleY + rectangleHeight - size) rectangleWidth size)
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drawRect'
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:: G.GeglNode -- ^ Target Node
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-> G.Color -- ^ Color to draw in
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-> DrawType -- ^ Draw type
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-> G.GeglRectangle -- ^ Dimensions of Rectangle
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-> G.GeglBuffer -- ^ Final Buffer
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-> Affection us ()
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drawRect' node color Fill rect@GeglRectangle{..} buf = do
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ad <- get
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tempRoot <- liftIO $ G.gegl_node_new
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opNode <- liftIO $ G.gegl_node_new_child tempRoot $ G.Operation "gegl:rectangle"
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[ G.Property "x" $ G.PropertyDouble $ fromIntegral rectangleX
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, G.Property "y" $ G.PropertyDouble $ fromIntegral rectangleY
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, G.Property "width" $ G.PropertyDouble $ fromIntegral rectangleWidth
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, G.Property "height" $ G.PropertyDouble $ fromIntegral rectangleHeight
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, G.Property "color" $ G.PropertyColor color
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]
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diw <- liftIO $ G.gegl_node_connect_to opNode "output" node "input"
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unless diw $ error "Affection.Draw.drawRect': connect failed"
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put $ ad
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{ drawStack = (DrawRequest rect buf (Kill tempRoot)) : drawStack ad
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}
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-- -- | force a blit of a specified area. Do not use often as it slows down the program
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-- present
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-- :: G.GeglNode -- ^ Node to blit
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-- -> G.GeglBuffer -- ^ BUffer to draw
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-- -> G.GeglRectangle -- ^ Area to blit
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-- -> Bool -- ^ Shall the drawing be cleared in the next run?
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-- -> Affection us ()
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-- present node buf rect pers = do
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-- ad <- get
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-- put $ ad
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-- { drawStack = (DrawRequest rect buf pers) : drawStack ad
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-- }
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-- ad <- get
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-- format <- liftIO $ B.babl_format $ B.PixelFormat B.RGBA B.CFu8
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-- liftIO $ SDL.lockSurface $ drawSurface ad
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-- liftIO $ G.gegl_node_blit
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-- rect
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-- format
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-- nullPtr
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-- 0
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-- [G.GeglBlitDefault]
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-- liftIO $ SDL.unlockSurface $ drawSurface ad
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-- liftIO $ SDL.updateWindowSurface $ drawWindow ad
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-- | function for handling 'DrawRequest's and updating the output
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handleDrawRequest
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:: Ptr a -- ^ Pixel buffer to blit to
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-- -> B.BablFormatPtr -- ^ format to blit in
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-> Int -- ^ Stride
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-> Int -- ^ Components per Pixel
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-> DrawRequest -- ^ 'DrawRequest' to handle
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-> Affection us (Maybe DrawRequest)
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handleDrawRequest pixels stride cpp dr@DrawRequest{..} = do
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ad <- get
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let surf = drawSurface ad
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liftIO $ SDL.lockSurface surf
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liftIO $ G.gegl_buffer_get
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requestBuffer
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(Just requestArea)
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1
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(Just $ drawFormat ad)
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(pixels `plusPtr`
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(rectangleX requestArea * cpp + rectangleY requestArea * stride))
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stride
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G.GeglAbyssNone
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liftIO $ SDL.unlockSurface surf
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-- liftIO $ SDL.updateWindowSurface $ drawWindow ad
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case requestPersist of
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Yes ->
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return Nothing
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Kill _ ->
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return $ Just dr
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-- | clear a previously drawn area
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invalidateDrawRequest
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:: Ptr a -- ^ Pixel buffer to blit to
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-- -> B.BablFormatPtr -- ^ format to blit in
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-> Int -- ^ Stride
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-> Int -- ^ Components per Pixel
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-> DrawRequest -- ^ Drawrequest to invalidate
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-> Affection us ()
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invalidateDrawRequest pixels stride cpp dr@DrawRequest{..} = do
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ad <- get
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let surf = drawSurface ad
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liftIO $ clearArea requestBuffer requestArea
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liftIO $ SDL.lockSurface surf
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liftIO $ G.gegl_buffer_get
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requestBuffer
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(Just requestArea)
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1
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(Just $ drawFormat ad)
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(pixels `plusPtr`
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(rectangleX requestArea * cpp + rectangleY requestArea * stride))
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stride
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G.GeglAbyssNone
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liftIO $ SDL.unlockSurface surf
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let Kill victim = requestPersist
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liftIO $ G.gegl_node_drop victim
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-- liftIO $ SDL.updateWindowSurface $ drawWindow ad
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-- | compute color for a single pixel
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colorize
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:: (G.ComponentValue, G.ComponentValue, G.ComponentValue, G.ComponentValue) -- ^ Pixel information in buffer
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-> G.Color -- ^ Color to draw over
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-> (G.ComponentValue, G.ComponentValue, G.ComponentValue, G.ComponentValue) -- ^ Resulting colour
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colorize (rr, rg, rb, ra) col =
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let (G.CVdouble (CDouble br)) = rr
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(G.CVdouble (CDouble bg)) = rg
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(G.CVdouble (CDouble bb)) = rb
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(G.CVdouble (CDouble ba)) = ra
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(cr, cg, cb) = case col of
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G.RGBA r g b _ -> (r, g, b)
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G.RGB r g b -> (r, g, b)
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ca = case col of
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G.RGBA _ _ _ a -> a
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G.RGB _ _ _ -> 1
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alpha = ca
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dst_a = ba
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da = alpha + dst_a * (1 - alpha)
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a_term = dst_a * (1 - alpha)
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red = cr * alpha + br * a_term
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gre = cg * alpha + bg * a_term
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blu = cb * alpha + bb * a_term
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in
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( G.CVdouble $ CDouble $ red / da
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, G.CVdouble $ CDouble $ gre / da
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, G.CVdouble $ CDouble $ blu / da
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, G.CVdouble $ CDouble $ ca
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)
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unsafeColorize col =
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let
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(r, g, b) = case col of
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G.RGBA cr cg cb _ -> (cr, cg, cb)
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G.RGB cr cg cb -> (cr, cg, cb)
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a = case col of
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G.RGBA _ _ _ ca -> ca
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G.RGB _ _ _ -> 1
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in
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( G.CVdouble $ CDouble $ r
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, G.CVdouble $ CDouble $ g
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, G.CVdouble $ CDouble $ b
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, G.CVdouble $ CDouble $ a
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)
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-- -- | Clear all data from a buffer
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-- clear
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-- :: G.GeglBuffer -- ^ Target buffer
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-- -> IO ()
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-- clear buf = clearArea buf =<< G.gegl_rectangle_infinite_plane
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-- | Clear a specified area of a buffer from all data
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clearArea
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:: G.GeglBuffer -- ^ Target buffer
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-> G.GeglRectangle -- ^ Area to clear
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-> IO ()
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clearArea = G.gegl_buffer_clear
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